Alternating-current-brake-magnet apparatus.



A. SUNDH. ALTERNATING CURRENT BRAKE MAGNET APPARATUS.'l

APyLIoATIN FILED 00T. 9, 1905.

, Patented July 9, w12.'

INVENTOR WITNESSES:

' ATTORNEY W6: WWK-?? UNTTED 'STATES' PATENT @FFI-CE?4 AUGUST SUNDH, or YoNKERs'NEW YORK, ASSIGNOR To oTIS ELEVATOR coMrANY, or JERSEY cITY,-NEW JERSEY, A CORPORATION 0E NEW JERSEY.

Teelt/whom t may concern: u l

Be it known that I, AUGUST SUNDH, a

citizen of the United States, andresiding at efficient means for retarding or checking'the movement of the armature of. an alternating current electro-magnet', which may b`e used for releasing brake-applying means.

'More particularly it is the object of the present.v invention to combine a dash-pot with an electro-magnet which is operated by f alternating or pulsating currents to effect@ 12, 12', the nut 23 is :tightened and-locked Other objects of -my vinvention 4will a-p-y pear hereinafter, the novel combinations of the release .of brake-applying means.

elements being pointed out in claims.

line a, a.

applying means.

- the casing is Secured a' yoke 3, to which is central portion of the'yoke 3 is secure a Y frame 9 to which are secured laminatedsecuredthe electro-magnet 4. This electromagnet may be any suitable alternatingcur- `rent electro-magnet,- such as disclosed, for

example, in the patent to Lindquist, 7646.08, 'July 12th, 1904, electro-magnetyor-fin the patent to Lindquist,

744733, November 24th, 1903,'electro-magnet. A

The upper portionof the yoke 3vis eX- tended into a cup 5, the purpose otwhi'ch will be explained hereinafter. To the'up erv sleeve 6,'sueh sleeve being in this instance vscrew threaded into the Ayoke, and prevented .from rotationby a set screw 7, after said` poles. 10 means of pins 11, 1 1 which are .Y 'preferablyv composed 4of wood fiber. vl-Sef,

l speeication of Lettersratent. A Application vled October 9, 1905. I Serial 110.281,922.

1 designates a box or casing mounted on; the bed-plate 2 and inclosing the brake- On. the upper portion oli" ALTERNATINe-cURRENT-ERKE-MAGNET APEARATUS.

cured to the lower portion oithe fixed poles 10,-are .the electro-magnet spools or Solenoids 12 and 12',y Said poles project half way into lsaid solenoids, which are heldin place on the downwardlyl projecting sleevel4by means of a nut. 13.v The armature comprises a plurality VPel? laminated projec- "ratentea July 9, 1912.

tions corresponding to the poles 10, 10 and Asecured to the sleeve 18 by means of pins` 17 and .17Av which are-driven 'through thear-mature frame 16, the projections 15,`and part way into thearmature sleeve 18.. The

-sleeve 18 iS provided with a centra-l10n- 'tudinal .screw-threaded hole. 19, through .which is vextended the screw-threaded portion 20 of the .rod.2.1. After the armature is adjusted in position so that .t-heprojections 15, 15 may enter the various spoolsinto positionbythe nut 24..

The rod 21 extends upwardly through `t-he longitudinal .hole 22 of the' electromagnet' In the .accompanying drawings, Figure 1 1 represents an elevational view of a brake and means for operating the same; an'd't Fig-2 lis a vertical sectional elevationalview 'taken at-right angles tofFig. 1 on the sleeve 6, yand is adapted .to move freely the rod 21 is .extended downwardly into a .cup 26 which h'as" a downward .projection 27. .Pivqted tofthis projection at 28 is a 2 vertical rod 29 Awhich is provided with'an enlarged. ,screw-threaded portion 30, on

therein. The screw-threaded portion v20 of which is placed. a combined 'nut andy brake'. I

spring holding means-31. 'The tension of the. brake'spring32- maybe adjusted by means oflsaid nut 3-1, and` after said adjustment'is made the nut 31'may be locked in positionby the locknut 37, the latter being retained inv place between the a.r1ular "re- -cesses 3 5and 36 of the yoke 3, and the upper portion of thecasing 1resp'ectively.

The lower portion 29. ofthe rod 29 is.

pivoted at 38 'to lthe bell-crank lever -40 whichis .-pivted at `41 to the standard 39, secured t0 the base plate2. The .arm-"70 ofthe bellfcra'n'k lever 4Q extends outwardly through an opening in the casing l, and has pivoted toit at 42 a link 43, which is 'pivoted at49 to an additional bell-crank lever oted at 46 to thestandard 45, and valso se- The last named bell-crank lever is piv- 10o.

pivoted at 5 1 vto a 105 any purpose desired, or example, the operation ot hoisting apparatus for elevator cars.

yoke 3 is `provided with a substantially airtight cap 55, so to have a chamber 71 which is entirely inclosed. Although the rod 21 has a tree movement in the hole 22 ot the sleeve 6, it should t therein preterably as nearly air-tight as practicable. ln order to secure such an air-tight lit a leather washer or a stuling box may be placed between the rod 21 and the sleeve 6, it desired.

The upper end ot the rod 21 is shown as sci ew-threadcd at 59, and provided with a shoulder G1. A cup-sliaped piston 57 has a central hole 58 which may be screw threaded and fitted over the screw-threaded portion 59, and secured rigidly in place against the shoulder G1 by means of the nut 60.

At 62 is a hole which a'ords communication between the under side and upper side of tlie piston 57, but is normally closed by means of the valve G3 which is held in closed position by the spring 65. This spring. is held in place by means of a bolt- Get, which is secured rigidly to the upper side ot the piston 57. The valve G3 is pivoted at 66 to the trame 67 which may be secured in any suitable maniier, as by means of the set-screw 68, to the upper side of the piston 57.

`When the electro-magnet is energized the parts will assume the position shown in\ F ig. 2.' The brake spring 32 will be compressed, the rod 29 moved upwardly and the link t3 to the left, as viewed in Fig. 1, and conscquently the brake bands 48 and 50 moved out ot contactl with the. brake pulley Fig. 1 however, shows the brake applied. When the electro-magnet is deiiergized the valve G3 will open automatically and allow tree downward movement of the piston 57, and therefore a quick application of the brake. Should the brake bands wear so that the bottom of the piston 57 would strike against the surface 8 when the brake is applied, the said piston 57 may be adjusted by releasing' the lock nut 25 and turning the rod 21 so as to move the same upwardly to the desired extent, and then again securing the nut 25 iii position against thefuppcr portion ot the cup 26. In this case the nuts 28 and 24 will also have to be loosened so that the rod 21 may be turned, and then again 'secured in original position.

1t has been found in practice that when the alternating current magnet is energized, the armature is drawn up too suddenly and the brake released too quickly thus tending to injure some of the parts by not giving The cup 5 at the upper portion of the them time to acquire momentum.v That is, the tendency would be to jerk lthe various elements apart by the very sudden or quick movement of the armature when the electromagnet is energized with'the alternating current. Another serious objection tothe use of alternating current magnets is the slamming of the pole faces together, which is notonly very noisy, but soon destroys the magnets. 1t has been ,proposed to use springs or other cushioning devices to pre,

vent thisslamming, but such devices do not prove entirely etlicient, and are impractical, as they prevent the magnet surfaces from coming together, and thus cause a great waste of current. 1t is therefore necessary to have some retarding device to prevent this sudden movement and obtain, on the contrary, a gradual upward movement of the armature to safely operate the brake# releasing means. It should be noted that in the operation of the device, that is, when the electro-magnet is energized and the armature drawn upwardly, the valve 63 is automatically closedso as to form a cushion of air in the chamber 71 on the upper side ot the piston 57. Furthermore, a partial vacuum is formed on the under side of the piston 57 which assists the effect of the air cushion in checking or retarding the sudden movement of the armature to its final attracted position.

Instead of relying on the action of air or a partial vacuum for retarding the upward movementfof the armature, the chamber 71 may be filled with a liquid such as oil, if desired, and the valve 63 omittedand one or more holes 62 of suitable size provided in tuhe bottom of the cup piston 57 to serve to restrict the flow of the fluid from the upper side to the lower side of said piston. Ur in addition to the' restricted passages, a valve opening upwardly may be provided so that the piston may have a quick downward movement. Or the piston 57 may have no restricted passages or no valves at all, but tit lso loosely in the cup 50 as to allow a liquid to How around the same from the upper Vto the lower side and vice versa, in which case the sudden upward movement of the yarmature will also be checked and retarded.

Although I have herein shown only one form of the embodiment et my invention, it is obvious that various changes in the details ot construction and arrangement' of pai-ts may occur to and be made by those skilled inthe art, without' departing from the spirit and scope ot my invention. 1

y therefore do not wish to be limited strictly to 1 the 'construction herein described and shown.

`What claim and desire to have protected by Letters Patent of the United States, is z- 1. The combination with an alternating to the parts to be actuated, a cup piston convnected rigidly With said armature, and a substantially air-tight casing Wholly inelosing said piston. 2. The combination With an alternating current magnet, of a supporting yoke therefor, a cylindrical cup on the upper portion of said yoke, an armature, a piston connected to said armature and movable in said eup, and' a substantially airtight eap for said cup. y

3. The` combinationwith an alternating current magnet, of a supporting yoke therefor, a cylindrical cup formed integral With said yoke, an armature, a piston rigidly conneoted to said armature and movable in said current magnet, of a supporting frame therefor, a cylindrical eup carried by said frame, a Captor the cup forming therewith an air-tight closure, a piston adapted to reciprocate in said cup, a check Valve in said piston, and an armature Jfor the magnet connected to the piston. A

In testimony whereof, vIhave signed my name to this specification in the presence of tWo subscribing Witnesses.

AUGUST SUNDH. ,Witnesses:

FRANK T. BROWN, CHARLES M. NissEN. 

